Additional to above, tried to run 'update-grub2'. This returned:
Generating grub.cfg ... /etc/grub.d/00_header: 139: Bad substitution
@ubuntu:~$
Additional to above, tried to run 'update-grub2'. This returned:
Generating grub.cfg ... d/00_header: 139: Bad substitution
/etc/grub.
@ubuntu:~$